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(No Model.)

1 A. WRIGHTSON.

0AM FOR KNITTING MACHINES.

No. 244,353. Patented July 12,1881.

[1&2 Y 1 1424 Pmljlhogmphcr. Washington a. c.

' UNITED STATES PATENT OFFICE.

ARTHUR WRIGHTSON, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO CHARLES SHIRTGLIFF, OF SAME PLACE.

CAM FOR KNITTING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 244,353, dated July 12, 1881.

Application filed April 7, 1881. (No model.)

To all whom it may concern Be it known that I, ARTHUR WRIGHTSON, a citizen of theUnited States, residing in Philadelphia, Pennsylvania, have invented an Improvement in Oams for Knitting-Machines, of which the following is a specification.

My invention relates to an improvement in that class of knitting-machine cams having an adjustable portion whereby the cam is adapted for acting upon the jacks of the necdlesin such a manner as to produce either plain or tuck work, the object of my improvement being to construct an edective cam of this class which can be readily and cheaply manufactured.

In the accompanying drawings, Figure l is a perspective view of my improved cam adapted for operating the needles so as to produce plain work; Fig. 2, the same adapted for the production of tuck-work; Fig. 3, a vertical section of a portion of the head of a knitting-machine with the cam adjusted as in Fig. 1 Fig. 4, the same with the cam adjusted as inxFig. 2, and Fig. 5 a perspective view of another cam made according to my invention.

The tuck-cams in general use hitherto are similar to ordinary plain cams with the exception that a portion of the nose of the cam is cut away, so that the cam will act in connection with tuck-jacks on certain of the needles to effect but a partial elevation or depression of said needles, thereby causing the dropping of stitches and the production of tuck-work.

When it is desired to substitute a plain cam for such a tuck-cam the machine must be taken apart, the tuck-cam removed, and a plain cam secured in its place; and in order to avoid this delay and expense cams have been made with slides which can be adjusted so as to adapt a single cam for the production of either plain or tuck work. Such cams, however, are costly, as they require considerable fitting of the parts.

In my improved cam I dispense with slides, and use an arm, a, pivoted to the cam A, adjacentto theinclined acting edge I) of the same, and adapted to be vibrated so as to assume either of the positions shown in Figs. 1 and 2. When adjusted to the position shown in Fig. 1 the arm a coincides with the acting edge I) of the cam A, and the tuck-jacks 00, Fig. 3, are elevated thereby to the same extent that the plain jacks are elevated by said acting edge I), so. that all of the needles receive stitches, and

plain work is produced. When the arm is turned down, as shown in Figs. 2 and at, how-- ever, the tuck-jacks 00 are not elevated, and the 5 5 needles carried by these jacks consequently lose stitches, thus producing the desired tuckwork.

The face of the cam A is recessed, so as to form a shoulder, d, and thus provide a seat for the arm a when the latter is turned down, as shown in Fig. 2. This, however, is not essential, as the arm or might be used in connection with a cam of uniform thickness throughout.

Various means of vibrating the arm a may be adopted.

In Figs. 2 and 3 I have shown an arm,f, arranged on the outside of the head B, and connected to the pivot-pin of the arm a, said arm f possessing a slight elasticity, and carrying a pin which may be adapted to openings or recesses in the head, so as to retain the arm in either of its extreme positions.

The cam shown in Figs. 1 to 4 is intended for use in connection with bottom tuck-jacksthat is to say, jacks the projections of which are recessed on the under edge. In order to adapt it to top tuck-jacks the cam is reversed, as shown in Fig. 5, the arm a in this case being preferably shorter than that shown in Figs. 1 and 2.

I claim as my invention- 1. A V-shaped knitting-machine cam having an arm, a, pivoted thereto adjacent to the inclined acting edge b, as described, said arm being capable of turning so as to coincide with said acting ed go of the cam to operate the tuckjacks, and so as to assume a horizontal position, in which it fails to operate said jacks, as set forth.

2. The combination of the V-shaped cam A, having its face recessed to form a shoulder, 01, with the arm a pivoted to said cam adjacent to its inclined acting face I), and in line with said shoulder d, on which the arm rests when depressed, as set forth.

In testimony whereof Ihave signed my name to this specification in the presence of two subscribing witnesses.

ARTHUR wnien rsolv.

Witnesses:

JAMES F. TOBIN, HARRY SMITH. 

